Hi. I just tried 2.6.11 + jeff's patches (which are now against 2.6.11 and appear to include bodo's patch from below).
With this codebase I was able to startup tomcat without getting the kernel crash I reported previously. Cool.
There were some problems though. My feedback on this setup is below. The main showstopper is an issue where the guest UML sucks up all available CPU. I've gone back to using 2.6.9-bs7 for the time being.
Regards, Peter http://rimuhosting.com
bodo's fp-state would not apply (at least with patch -p 1). All other patches went in OK.
Got this:
HOSTCC scripts/kallsyms
HOSTCC scripts/bin2c
CC init/main.o
In file included from include/asm/pgtable.h:28,
from include/linux/bootmem.h:7,
from init/main.c:30:
include/asm/pgtable-3level.h: In function `pfn_pmd':
include/asm/pgtable-3level.h:138: warning: implicit declaration of function `__pmd'
include/asm/pgtable-3level.h:138: incompatible types in return
make[1]: *** [init/main.o] Error 1
make: *** [init] Error 2
make linux
Had to disable the 3level page table option inside the UML specific options.
Got:
CC arch/um/drivers/ubd_kern.o
CC arch/um/drivers/x11_kern.o
CC arch/um/drivers/x11_user.o
arch/um/drivers/x11_user.c:10:19: X11/X.h: No such file or directory
arch/um/drivers/x11_user.c:11:22: X11/Xlib.h: No such file or directory
arch/um/drivers/x11_user.c:12:23: X11/Xutil.h: No such file or directory
arch/um/drivers/x11_user.c:13:24: X11/keysym.h: No such file or directory
arch/um/drivers/x11_user.c:14:33: X11/extensions/XShm.h: No such file or directory
arch/um/drivers/x11_user.c:23: syntax error before "Display"
arch/um/drivers/x11_user.c:23: warning: no semicolon at end of struct or union
arch/um/drivers/x11_user.c:24: warning: type defaults to `int' in declaration of `root'
arch/um/drivers/x11_user.c:24: warning: type defaults to `int' in declaration of `win'
Disabled X11 Framebuffer driver
Got:
CC arch/um/drivers/random.o
LD arch/um/drivers/built-in.o
arch/um/os-Linux/Makefile:15: *** commands commence before first target. Stop.
make: *** [arch/um/os-Linux] Error 2
make linux
In the Makefile I saw:
user-objs-$(CONFIG_TTY_LOG) += tty_log.o
USER_OBJS := $(user-objs-y) aio.o elf_aux.o file.o helper.o irq.o main.o
mem.o process.o sigio.o signal.o start_up.o syscall.o trap.o time.o \
tt.o tty.o uaccess.o umid.o util.o
Changed that to USER_OBJS := $(user-objs-y) aio.o elf_aux.o file.o helper.o irq.o main.o \
(Excuse the email wrapping. Basically the first USER_OBJS line is missing a trailing '\').
When I start it up the UML sits maxing out the CPU. I think vanilla 2.6.11 UML guests do that as well.
38 processes: 35 sleeping, 3 running, 0 zombie, 0 stopped
CPU states: cpu user nice system irq softirq iowait idle
total 2.6% 0.0% 0.0% 97.3% 0.0% 0.0% 0.0%
Mem: 255660k av, 48348k used, 207312k free, 0k shrd, 4320k buff
Checking for the skas3 patch in the host:
- /proc/mm...found
- PTRACE_FAULTINFO...found
- PTRACE_LDT...found
Checking PROT_EXEC mmap in /tmp...OK
Linux version 2.6.11-rimu6 ([EMAIL PROTECTED]) (gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-42)) #1 Sat Mar 5 22:07:34 UTC 2005
Built 1 zonelists
Kernel command line: con=null con0=fd:0,fd:1 eth0=tuntap,tap39 mem=256M ubd7=/dev/shm2/tmp/fc3.rimuhosting.com/swapfs.swp ubd0=/home/umlusers/fc3.rimuhosting.com/wbl3-3.backingfilenota.cow root=98:0
PID hash table entries: 2048 (order: 11, 32768 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 255488k available
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
Checking for host processor cmov support...Yes
Checking for host processor xmm support...No
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...missing
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
Checking for /dev/anon on the host...Not available (open failed with errno 2)
NET: Registered protocol family 16
Bodo Stroesser wrote:
Bodo Stroesser wrote:
Jeff Dike wrote:
The write_ldt just above the segfault in both stacks looks suspicious.
Yes. There seems to be a problem with this new stuff.
Peter, could you please send a full call trace? I guess, the ones in your mail are truncated, right?
Bodo
Meanwhile I found a problem in arch/um/sys-i386/ldt.c, which causes UML to panic, if LDT-entry number 8 is written, using modify_ldt-syscall.
This crash is very similar to the one Peter had, so I hope the appended oneliner will solve the problem.
Bodo
------------------------------------------------------------------------
---
diff -puN arch/um/sys-i386/ldt.c~fix-skas-ldt arch/um/sys-i386/ldt.c
--- linux-2.6.11-rc3-mm2/arch/um/sys-i386/ldt.c~fix-skas-ldt 2005-03-04 15:51:04.000000000 +0100
+++ linux-2.6.11-rc3-mm2-root/arch/um/sys-i386/ldt.c 2005-03-04 15:51:27.000000000 +0100
@@ -208,7 +208,7 @@ static int write_ldt(void __user * ptr, goto out_unlock;
if(ldt_info.entry_number >= ldt->entry_count &&
- ldt_info.entry_number > LDT_DIRECT_ENTRIES){
+ ldt_info.entry_number >= LDT_DIRECT_ENTRIES){
for(i=ldt->entry_count/LDT_ENTRIES_PER_PAGE;
i*LDT_ENTRIES_PER_PAGE <= ldt_info.entry_number;
i++){
_
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